SPRINGFIELD — Four Springfield police officers were injured while trying to contain a brawl outside the Fat Cat Bar and Grill on Worthington Street early Saturday morning.

Three officers were taken to the hospital while one was treated at the scene, police said. All suffered relatively minor injuries and will recover.

Around 20 officers were dispatched to the scene to control the fight. Nine people were arrested on various charges, including assault and battery on a police officer. All are expected to be arraigned Monday in Springfield District Court.

The incident comes on the heels of a debate over whether city bars can continue entertainment for patrons after 1 a.m. Mayor Domenic J. Sarno must issue a special permit for establishments to play televisions or music or host live entertainment until 2 a.m.

The mayor called a press conference this afternoon to discuss the dilemma and share his response to the incident with the public.